74HC14 Chinese information

Crystal oscillator

Probe domestic switch needle KG-300K needle head diameter is 3.0mm normally open switch needle

Quartz Oscillator 3225 20M OSC

The role of 74HC14: six-phase reverse Schmitt trigger

Truth table: Y=A

Input input output AYLHHL

Figure 1 pin function

Limit parameters:

Supply Voltage Supply Voltage 7VInput Voltage Input Voltage 7VOperating Free Air Temperature Range Free Air Temperature Range 0°C to +70°C Storage Temperature Range Storage Temperature Range -65°C to +150°C

Recommended Operating Conditions Recommended Operating Conditions

Symbol Symbol Parameter Parameter Minimum Typical Maximum UNIT Unit VCCSupply Voltage Supply Voltage 4.7555.25VVT+Positive-Going Input Threshold Voltage Positive Input Threshold Voltage (Note 2) 1.41.61.9VVT-Negative-Going Input Threshold Voltage Reverse Input Threshold Voltage (Note 2) 0.50.81VHYSInput Hysteresis Input Hysteresis (Note 2) 0.40.8-VIOHHIGH Level Output Current High Level Output Current---0.4mAIOLLOW Level Output Current Low Level Output Current --8mATAFree Air Operating Temperature Operating Temperature 0-70°C Note 2: VCC = 5V.

Electrical Characteristics Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Symbol Parameter Condition Conditions Minimum Typical Maximum UNIT Unit VIInput Clamp Voltage Input Clamp Voltage VCC = Minimum, II = -18mA---1.5VVOHHIGH Level Output Voltage Output high level voltage VCC=minimum, IOH=maximum VIL=maximum 2.73.4-VVOLLOW Level output low level voltage VCC = minimum, IOL = maximum -0.350.5--Output Voltage output voltage VIH = minimum ---VVCC = minimum, IOL = 4mA-0.250.4IT+Input Current at Positive-Going Threshold Positive threshold input current VCC = 5V, VI = VT+--0.14-mAIT-Input Current at Negative-Going Threshold Reverse threshold input current VCC = 5V, VI = VT---0.18-mAIIInput Current @ MAX Input Voltage Input Current @Maximum Input Voltage VCC = Maximum, VI = 7V--0.1mAIIHHIGH Level Input Current Input High Level Current VCC = Maximum, VI = 2.7V- -20μAIILLOW Level Input Current input low level current VCC = maximum, VI = 0.4V---0.4mAIOSShort Circuit Output Current short circuit output current VCC = maximum (Note 4) -20--100mAICCHSupply Current with Out puts HIGH High Output Current VCC = Maximum -8.616mAICCLSupply Current with Outputs LOW Low Output Supply Current VCC = Maximum -1221mANote 3: VCC = 5V, TA = 25°C. Note 4: Not more than one output should be shorted at a time, and the duration should not exceed one second.

Switching Characteristics Switching Characteristics at VCC = 5V and TA = 25°C

Switching Characteristics Switching Characteristics at VCC = 5V and TA = 25°CSymbol Symbol

Parameter parameter

RL = 2kΩ UNIT Unit CL = 15pFCL = 50pF Minimum Maximum Minimum Maximum tPLHPropagation Delay Time LOW-to-HIGH Level Output Low to High Output Delivery Delay Time 522825nstPHLPropagation Delay Time HIGH-to-LOW Level Output High to Low Output Delivery Delay time 5221033ns

Application circuit:

Figure 2 Photoelectric coupler receiving shaping circuit

Figure 3 square wave oscillator